鸡付伤寒是（）传染病。A、接触传染病B、内源性条件性传染病C、直接接触性传染病

浇筑混凝土管座时，应遵守的规定有（）。

A．槽深超过2m时必须采用串筒或滑槽来倾倒混凝土

B．管座模板支设高度宜略高于混凝土的浇筑高度

C．分层浇筑时，在下层混凝土强度达到5MPa时，方可浇筑上层混凝土

D．变形缝的位置应与柔性接口相一致

E．按规范要求留置混凝土抗压强度试块

阅读理解。

     You are probably familiar with the saying: An apple a day keeps the doctor away. A recent research

carried out by the Chinese University of Hong Kong may change the saying: An apple a day may keep aging

away.

     The research chose fruit flies (果蝇), as they share many genes (基因) with humans. The fruit flies were

either fed normally or had an apple extract (浓缩物) added to their diet.

     It turned out that those fruit flies that were given apple extract lived about 55 days - five days longer than

the flies that were normally fed. The research group also found it easier for the flies to walk, climb and move

about as they aged.

     According to the result, the researchers believed that the antioxidants (抗氧化剂) in the apple extract

helped clean up dangerous chemicals (化学物质) that cause illnesses, as well as aging.

     In another study, researchers examined diets of thousands of women. They discovered that those who

regularly ate apples were 20 percent less likely to suffer heart illnesses and stroke.

     The apples' genetic code (欲望) was discovered recently. It allows scientists to develop nicer and healthier

fruits. Researchers are already using the information to grow a kind of apples full of antioxidants that can keep

eyes and joints healthy and protect humans against heart illnesses and cancer.

     Apples that kill the desire (欲望) to eat could also be produced, with the first "extra-healthy" apples on

supermarket shelves within just four or five years.

     The team that keeps studying apple DNA includes 100 scientists from five countries. Their research also

suggests that around 65 million years ago, when dinosaurs began to die off, the plant, which would finally

become today's apple tree, experienced a great genetic change. The number of many of its genes doubled.

The extra genes allowed the apple to get used to worse conditions and go through a different development

from peaches, strawberries and other related fruits.

1. Why were fruit flies used for the research?

A. Because they have a similar diet to humans.

B. Because they have a history as long as apples.

C. Because they share a lot of genes with humans.

D. Because they feed on nothing but apple extract.

2. What result did the researchers find out?

A. Apples produce chemicals that can change human genes.

B. Apples have antioxidants that kill chemicals that cause aging.

C. Apples are rich in vitamins that are needed in humans' bodies.

D. Apples produce chemicals that make apples taste more delicious.

3. What happened to apples around 65 million years ago according to the research?

A. Their genes stopped their development as the environment got worse.

B. Their genes became twice in number but they finally died off like dinosaurs.

C. They experienced a great genetic change making them used to worse conditions.

D. They went through a similar development to peaches, strawberries and other related fruits.

4. What can we infer (推断) from the passage?

A. Eating apples may bring us more advantages than we might believe before.

B. People who have the habit of eating apples don't need to see a doctor.

C. Apples that kill the desire to eat are already available in supermarkets now.

D. People will eat apples instead of peaches and strawberries from now on.

出现Cheyne－Stokes和Biots呼吸最主要的机制为（）

A.胸部外伤呼吸受抑制

B.胸腔积液呼吸受抑制

C.呼吸中枢兴奋性降低

D.呼吸肌麻痹

E.严重神经衰竭

架空光缆线路的杆距超过标准杆距（）时，应采用长杆档建筑方式，超过标准杆距100%的杆距应采用飞线装置。

A、10%～20%

B、25%～100%

C、15%

陈旭麓在《近代中国的新陈代谢》指出：“这场战争，自西方人1514年到中国起，是他们积325年窥探之后的一逞。对于中国人来说，这场战争是一块界碑。它铭刻着中世纪古老的社会在炮口逼迫下赶往近代的最初的一步。”文中的“这场战争”是（）

A.鸦片战争

B.第二次鸦片战争

C.甲午战争

D.八国联军侵华战争